bug-gnu-emacs
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

bug#29066: 26.0.90; crash in gc involving buffer local symbols


From: Andreas Schwab
Subject: bug#29066: 26.0.90; crash in gc involving buffer local symbols
Date: Tue, 31 Oct 2017 23:00:10 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

On Okt 31 2017, Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Andreas Schwab <schwab@linux-m68k.org>
>> Cc: vgatien-baron@janestreet.com,  29066@debbugs.gnu.org,  
>> mshinwell@janestreet.com
>> Date: Tue, 31 Oct 2017 22:03:26 +0100
>> 
>> >> A symbol on the symbol_free_list is a freed symbol, not available for
>> >> use.
>> >
>> > I guess you are saying that sweep_symbols has a bug?  Because it hits
>> > this "freed" symbol every GC, AFAICT.
>> 
>> Since GC is special, it needs to do special things.
>
> But the crash due to double-free did happen as part of GC doing those
> "special things".

That's why it helps to clear the pointer to the freed memory, instead of
leaving it dangling.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."





reply via email to

[Prev in Thread] Current Thread [Next in Thread]